"Embedded Resource Handling Causes Claude MCP Prompt Execution Crash"

Bug Description
When using embedded resources in an MCP prompt, claude permenantly crashes. Here is the MCP server code to test https://gist.github.com/whynotavailable/dcb8580dc5381c7c5946b5f9c5450e1b , I confirmed with claude desktop that the correct response happens, but when trying to execute the prompt in claude code is fails, and all future prompts fail.

Environment Info

• Platform: macos
• Terminal: ghostty
• Version: 0.2.56
• Feedback ID: c3951fdf-7d66-4b51-9406-43762938652f

Errors

[{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.0.content.0.image.source.base64.media_type: Field required\"}}\n    at H6.generate (file:///Users/josephdotson/.bun/install/global/node_modules/@anthropic-ai/claude-code/cli.js:1054:10176)\n    at $6.makeStatusError (file:///Users/josephdotson/.bun/install/global/node_modules/@anthropic-ai/claude-code/cli.js:1058:7207)\n    at $6.makeRequest (file:///Users/josephdotson/.bun/install/global/node_modules/@anthropic-ai/claude-code/cli.js:1058:8149)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)","timestamp":"2025-03-29T18:19:33.666Z"}]